JPH0733032B2 - Injection mold - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold for integrally molding a window frame member on a peripheral portion of a glass using a predetermined glass as an insert.

2. Description of the Related Art For example, for a side window of an automobile, referred to as a modular window method, a synthetic resin window frame member (end rubber) 2 is preliminarily integrated with a peripheral portion of a window glass 1 as shown in FIGS. 4 and 5. It has been conventionally practiced to perform joint molding (for example, JP-A-57-1737). Sixth
FIG. 7 and FIG. 7 show an example thereof, in which the positioning projection 4 is formed in advance on the mold surface on the core block 3 side,
After positioning the window glass 1 with the projection 4 as a reference, the core block 3 and the cavity block 5 are clamped. Then, by filling the resin into the product space R from a sprue (not shown), the window frame member 2 is integrally joined and molded to the peripheral edge of the window glass 1 as shown in FIGS. 4 and 5. become.

Problems to be Solved by the Invention In the conventional mold structure as described above, the fixed protrusion 4 is used.
Since the position of the windshield 1 is regulated by the contact between the windshield 1 and the glass end face, if the windshield 1 may move under the resin filling pressure, for example, the glass 1
Will be damaged. In particular, since the window glass of an automobile usually has a predetermined curvature, when the core block 3 and the cabty block 5 are clamped, the curvature of the glass is corrected and the glass end face is strongly pressed against the protrusion 4. The glass breakage as described above will occur.

Further, since the above-mentioned protrusion 4 is still protruding in the product part space R of the window frame member 2, the notch 4a corresponding to the protrusion 4 remains in the product as shown in FIG. This is one of the causes of the deterioration of the appearance quality of the product.

Means for Solving the Problems The present invention provides a mold structure that solves the above problems, and as shown in the embodiments, one of the molds has a locate pin that serves as a positioning reference portion for glass. The locate pin is slidable in the direction perpendicular to the glass end face between the position of the window frame member projecting into the product space and the position retracted from the product space, and It is configured to retract to the retracted position by the material injection pressure of the member.

The locate pin is projected into the product space by a coil spring or air pressure at least when the glass is set, and is retracted by the pressure when the material of the window frame member is injected.

Action According to the above structure, since the locate pin itself is slidable, when the glass end face is strongly pressed against the locate pin, the locate pin is also displaced at the same time to prevent the glass from being broken. Further, if the locate pin is retracted when the injection of the material is completed, no trace of the locate pin remains on the window frame member to be molded.

Embodiments FIGS. 1 and 2 are views showing an embodiment of the present invention. FIG. 2 shows the overall structure of a mold, and FIG. 1 shows the details of section A in FIG.

In FIG. 2, 10 is a spacer block, 11 is a core block as a lower mold, 12 is an ejector plate, and an ejector pin 13 is connected to the ejector plate 12 as is well known. The ejector pin 13 is a guide pin. It is guided by 14 and goes up and down.

Reference numeral 15 is a runner block, and 16 is a cavity block as an upper mold. The product portion space R is defined by holding the glass 1 between the cavity block 16 and the core block 11. A vacuum cup 17 for adsorbing and supporting the glass 1 is attached to the cavity block 16, and the vacuum cup 17 is biased downward by a coil spring 18 incorporated therein.

Further, the cavity block 16 is provided with a horizontal locate pin 19 that regulates the horizontal position of the glass 1.
The locate pin 19 has a stepped shaft shape as shown in FIG. 1, and is slidably inserted into a mounting hole 20 formed in the cavity block 16. On the other hand, the position of the locate pin 19 relative to the glass 1 is the axial center. It is set at a position offset above the center of the glass 1 in the plate thickness direction. That is, the tip surface 19a of the locate pin 19 and the glass end surface 1
It is set such that about half of the end face area of the locate pin 19 protrudes from the glass end face 1a when they are brought into contact with a. This means that the tip end surface 19a of the locate pin 19 acts as a pressure receiving surface when the material injection pressure of the window frame member 2 is applied to the product space R as described later, and as a result, the locate pin 19 is moved. The force to push it back will work. The locate pin 19 is provided at a plurality of places as in the conventional case.

At the rear of the locate pin 19, a stepped shaft-shaped stopper 21 for restricting the backward limit position (retracted position) of the locate pin 19 is fixed by a plug 22. Then, when the locate pin 19 is retracted and its rear end face is seated on the stopper 21, the tip end face 19a of the locate pin 19 is the wall surface 1 of the product part space R.
The entire length of the locate pin 19 is set so as to be flush with 6a. A space 23 is defined between the locate pin 19 and the stopper 21, and an air supply path 24 is formed so as to communicate with the space 23.

That is, the locate pin 19 forms the glass end face 1a between the position projecting into the product space R (solid line position in FIG. 1) and the position retracted from the product space R (retracted limit position regulated by the stopper 21). It is slidable in the direction perpendicular to the plane, and can be held at the position indicated by the solid line in FIG. 1 by introducing air from the air supply passage 24 into the space 23.

When the window frame member 2 shown in FIG. 3 is molded by the above-mentioned mold, air is previously introduced into the space 23 from the air supply passage 24 under the mold open state, and the locate pin 19 is moved as shown in FIG. Then, it is made to project into the product space R. In this state, the glass 1 as an insert is applied to the mold surface of the cavity block 16 shown in FIG.
The glass end face 1a is pressed against 19a to position the glass 1 with the locate pin 19 as a reference. Then, with the completion of the positioning of the glass 1, the glass 1 is fixed by the negative pressure suction action of the vacuum cup 17.

Subsequently, when the core block 11 and the cavity block 16 are clamped, the glass 1 is clamped between them, and the glass end face 1a is slightly displaced by correcting the curvature of the glass 1. At this time, since the locate pin 19 is only assisted by the air pressure, the locate pin 19 is displaced following the movement of the glass end face 1a, thereby preventing the glass 1 from being damaged.

After this, the air supply to the space 23 is cut off and the atmosphere is released, and then the spool 25 shown in FIG.
The resin, which is the material of the window frame member 2, is injected to the. When the resin is injected into the product space R, the locating pin
The tip surface 19a of 19 receives the injection pressure and moves backward until the entire locate pin 19 comes into contact with the stopper 21. As a result, the tip end surface 19a of the locate pin 19 is flush with the wall surface 16a of the product space R, and no trace of the locate pin 19 remains on the side of the window frame member 2 to be molded.

After the injection is completed, the mold is opened and the glass 1 is opened as shown in FIG.
The window frame member 2 is taken out by the ejector pin 13 in such a manner that the window frame member 2 is integrally joined and molded on the entire circumference thereof.

Although air pressure is used as the means for biasing the locate pin 19 in the above embodiment, an elastic body such as a coil spring may be used instead of air pressure. However, the condition is that the force of the elastic body is set to be smaller than the injection pressure so that the locate pin 19 can be smoothly retracted when the resin is injected.

EFFECTS OF THE INVENTION According to the present invention, since the glass serving as the insert is positioned with reference to the slide type locate pin retracted from the product part space by the material injection pressure, for example, the glass generated by correcting the curvature of the glass Since the locate pin can follow the displacement, the glass is not damaged, and the trace of the locate pin does not remain on the window frame member to be molded.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the mold of the present invention, and FIG.
FIG. 2 is an enlarged view of a part, FIG. 2 is a sectional view of the entire mold, FIG. 3 is a perspective view of a molded product molded by the mold, and FIG. 4 is a perspective view of a conventional molded product. 4 is a sectional view taken along the line VV of FIG. 4, FIG. 6 is a sectional view of a main part of a conventional mold, and FIG. 7 is a perspective view of a main part of the mold of FIG. 1 ... Glass, 2 ... Window frame member, 11 ... Core block as lower mold, 16 ... Cavity block as upper mold,
19 …… Locate pin, 21 …… Stopper, 23 …… Space, 24
…… Air supply path, R …… Product space.

Claims (1)

[Claims] 1. A mold structure for integrally molding a window frame member on a peripheral edge portion of glass by using glass as an insert, and a glass positioning reference is provided to one of two molds for holding the glass. A locating pin that serves as a portion, and the locating pin is slidable in a direction perpendicular to the glass end face between the position of the window frame member protruding into the product portion space and the position retracted from the product portion space. And an injection mold which is configured to retreat to the retracted position by the material injection pressure of the window frame member.